Thirteenth century. The atlantic context

In the National Archive in Paris there is a wax imprint of the
seal of San Sebastian council, attached to a document dating
from 1297.
It depicts the most important type of ship in thirteenth-century
Atlantic Europe, responsible for beginning a boom in
maritime trade.
This type of ship was also used by other kingdoms with
which the Basques traded, especially England.
It was used by the Christian kingdoms in their military campaigns,
such as in the conquest of Seville in 1248, in which
Basque and Cantabrian ships played a decisive role in breaking
through the defences on the River Guadalquivir.